CN207819746U - Overcurrent protection driving circuit - Google Patents
Overcurrent protection driving circuit Download PDFInfo
- Publication number
- CN207819746U CN207819746U CN201721418995.9U CN201721418995U CN207819746U CN 207819746 U CN207819746 U CN 207819746U CN 201721418995 U CN201721418995 U CN 201721418995U CN 207819746 U CN207819746 U CN 207819746U
- Authority
- CN
- China
- Prior art keywords
- voltage
- unit
- input terminal
- schmidt trigger
- power cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of overcurrent protection driving circuit,It is characterized by comprising schmidt trigger units 100,Power cell 200,Feedback unit 300,First clamping unit 400,Delay unit 500,The output end 102 of schmidt trigger unit 100 and the input terminal 201 of power cell 200 connect,The output end 202 of power cell 200 and the input terminal 301 of feedback unit 300 connect,The input terminal 401 of the output end 302 of feedback unit 300 and the first clamping unit 400,The input terminal 501 of delay unit 500 connects simultaneously,The output end 402 of first clamping unit 400 and the output end 102 of schmidt trigger unit 100 connect,The output end 502 of delay unit 500 is connect with the input terminal 101 of schmidt trigger unit 100,Schmidt trigger unit is Schmidt's reverse phase trigger circuit；Have the characteristics that circuit structure is simple, protection is sensitive, at low cost, application prospect is good.
Description
Technical field
The utility model belongs to technical field of electronic control, and in particular to overcurrent protection driving circuit.
Background technology
Various direct current supplys load is required for controlling its operating current by control device, including DC control and
Pulse current controls, this just proposes power tube the technology requirement of anti-overcurrent etc..
But the control circuit of the prior art has following technical problem：
1, much do not have power tube overcurrent protection function, once overcurrent overheat, power tube easily damages.
2, partly there is the circuit of overcurrent protection function, usually series connection high current resistance carries out on the main line of power device
Current sample judges that again rupturing duty pipe input terminal controls signal, between this method belongs to when electric current is exceeded by comparison circuit
Stream sampling is taken over, the sampled signal comparison power tube overcurrent generation moment is lagged, and often serious overcurrent just starts
Protection act reduces the reliability of circuit the result is that damaging still more caused by power tube overcurrent.
3, circuit structure described in above-mentioned 2 is also complex, of high cost and performance is undesirable.
Or 4, partly having the special integrated chip of overcurrent protection function and having the shortcomings that above-mentioned protection lag, want
Its cost is higher.
5, the driving circuit for partly having overcurrent protection function does not have the auto-reset function after overcurrent protection, this needs electricity
Road, which restarts reset or in addition matches oscillating circuit on circuit, generates reset pulse progress separate excitation reset, this keeps circuit more tired
It is trivial.
6, the driving circuit volume for partly having overcurrent protection function is larger.
Because power driving circuit purposes is extremely extensive, so R ＆ D design is needed to go out, circuit is relatively simple, cost is relatively low, body
Product is small, detection overcurrent and protection act timely high reliability " overcurrent protection driving circuit ".
Utility model content
The purpose of this utility model is that design is a kind of " overcurrent protection driving circuit ", above-mentioned disadvantage can be reduced or overcome
End, improves the reliability of driving circuit.
To achieve the above object, it is that there is provided a kind of overcurrent protection driving electricity for technical solution that the utility model, which provides,
Road is characterized in that, including schmidt trigger unit 100, power cell 200, feedback unit 300, the first clamping unit
400, delay unit 500, wherein
The output end 102 of the schmidt trigger unit 100 and the input terminal 201 of the power cell 200 connect, described
The output end 202 of power cell 200 and the input terminal 301 of the feedback unit 300 connect, the output of the feedback unit 300
End 302 is connect simultaneously with the input terminal 501 of the input terminal 401 of first clamping unit 400, the delay unit 500, described
The output end 102 of the output end 402 of first clamping unit 400 and the schmidt trigger unit 100 connects, the delay unit
500 output end 502 is connect with the input terminal 101 of the schmidt trigger unit 100, and the schmidt trigger unit is close to apply
Special reverse phase trigger circuit；
In schmidt trigger unit output turn-on command signal, that is, first voltage, the power cell is made to be connected,
When the power cell normally, the normal saturation voltage drop signal of power tube, that is, second voltage warp of the power cell output
The input terminal of the positive and negative input terminal and the delay unit for being fed to first clamping unit of the feedback unit, it is described apply it is close
When special trigger element output first voltage, the first clamping unit clamping action is limited, makes the delay unit output third
Voltage, the tertiary voltage is less than the schmidt trigger unit input terminal by low raised first threshold, the third electricity
Pressure through the schmidt trigger unit anti-phase output first voltage, maintains the power cell conducting output second voltage and institute again
Only, this state is stable state；
When overcurrent occurs for the power cell, excessively high saturation voltage drop i.e. the 5th of the power tube of power cell output
Input terminal of the voltage through the positive and negative input terminal and the delay unit for being fed to first clamping unit of the feedback unit, makes institute
The capacitive energy storage for stating delay unit occurs change dramatically and exports the 6th voltage, and the 6th voltage makes higher than the first threshold
The 7th voltage of schmidt trigger unit anti-phase output enables the power cell end, the 8th electricity of power cell output
Pressure, meanwhile, the 8th voltage by the first clamping unit clamper, prolongs through the feedback unit described in the 6th voltage warp
Shi Danyuan and the clamping unit slowly fall after rise and/or are slowly fallen after rise through the schmidt trigger unit input terminal internal resistance, in institute
State the 6th current path to be not below the schmidt trigger unit input terminal by height reduce second threshold during, the work(
Rate unit ends and the state of the 8th voltage of output remains unchanged, this state is temporary stable state, when the 6th current path is to low
When second threshold, the 6th current path, which is the tertiary voltage, makes the schmidt trigger unit export first voltage,
It is connected and attempts to export the 8th voltage to make the power cell reset, if overcurrent releases, the power cell is carried out
The output of 8th voltage, whole system will restore the stable state of the power tube normally, if overcurrent continues, the power tube is also
The 5th voltage will be exported, and then repeats the overcurrent protection action and reseting procedure, the first threshold is more than second threshold
Value.
Further, the utility model additionally provides a kind of overcurrent protection driving circuit, is characterized in that, described to apply
Close spy's trigger element also has reference potential input terminal, for being provided with reference to electricity for the saturation voltage drop voltage value of the power cell
Pressure.
Further, the utility model additionally provides a kind of overcurrent protection driving circuit, is characterized in that, described to apply
Close spy's trigger element is hysteresis loop comparator.
Further, the utility model additionally provides a kind of overcurrent protection driving circuit, is characterized in that, described anti-
It includes diode to present unit 300, and the cathode of the diode connects the power list as the input terminal of the feedback unit
Member output end, for providing reference voltage for the saturation voltage drop voltage value of the power cell.
Further, the utility model additionally provides a kind of overcurrent protection driving circuit, is characterized in that, the institute
It includes diode and capacitance to state delay unit, and the diode is for making the capacitive energy storage change dramatically.
The utility model has the beneficial effects that：Circuit is relatively simple, cost is relatively low, small, detection overcurrent and protection are dynamic
Make in time, is high reliability " overcurrent protection driving circuit ".
Description of the drawings
Fig. 1 is the overcurrent protection driving circuit block diagram that the utility model embodiment provides；
Fig. 2 is that the utility model embodiment provides a kind of overcurrent protection driving circuit side with reference potential input terminal
Block diagram；
Fig. 3 is the overcurrent protection driving circuit structure with reference potential input terminal that the utility model embodiment provides
Schematic diagram；
Fig. 4 is another overcurrent protection driving circuit structure schematic diagram that the utility model embodiment provides；
Fig. 5 is the overcurrent protection driving circuit structure schematic diagram of another that the utility model embodiment provides；
Fig. 6 is the delay unit capacitor charge and discharge schematic diagram of circuit shown in Fig. 5 of the utility model embodiment offer
Specific implementation mode
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is done to be described in further detail, it is real
It applies example and is merely to illustrate the utility model, be not intended to limit the utility model, the interest field of the utility model is wanted by right
Ask restriction.
Embodiment 1
The utility model embodiment provides a kind of overcurrent protection driving circuit, as shown in Figure 1, the overcurrent protection drives
The structure feature of circuit is, including schmidt trigger unit 100, power cell 200, feedback unit 300, the first clamping unit
400, delay unit 500, wherein
The output end 102 of schmidt trigger unit 100 and the input terminal 201 of power cell 200 connect, power cell 200
Output end 202 and feedback unit 300 input terminal 301 connect, the output end 302 and the first clamping unit of feedback unit 300
400 input terminal 401, the input terminal 501 of delay unit 500 connect simultaneously, the output end 402 of the first clamping unit 400 and apply
The output end 102 of close spy's trigger element 100 connects, and the output end 502 of delay unit 500 is defeated with schmidt trigger unit 100
Enter 101 connection of end, schmidt trigger unit is Schmidt's reverse phase trigger circuit.
Its course of work is described below：
In schmidt trigger unit output turn-on command signal, that is, first voltage, power cell is set to be connected, when power list
When first normally, the normal saturation voltage drop signal, that is, second voltage of power tube of power cell output is fed to through feedback unit is positive and negative
The input terminal of first clamping unit and the input terminal of delay unit, when schmidt trigger unit exports first voltage, the first pincers
Bit location clamping action is limited, so that delay unit is exported tertiary voltage, tertiary voltage is less than schmidt trigger unit input terminal
By low raised first threshold, tertiary voltage through schmidt trigger unit anti-phase output first voltage, maintains power cell to lead again
Logical output second voltage is simultaneously stopped, this state is stable state；
When overcurrent occurs for power cell, saturation voltage drop i.e. the 5th voltage warp that the power tube of power cell output is excessively high is anti-
The input terminal for presenting the positive and negative input terminal and delay unit for being fed to the first clamping unit of unit, makes the capacitive energy storage of delay unit occur
Change dramatically simultaneously exports the 6th voltage, and the 6th voltage makes the 7th voltage of schmidt trigger unit anti-phase output higher than first threshold,
Power cell is enabled to end, power cell exports the 8th voltage, meanwhile, the 8th voltage is clamped through feedback unit by the first clamping unit
Position, the 6th voltage slowly fall after rise through delay unit and clamping unit and/or are slowly returned through schmidt trigger unit input terminal internal resistance
Fall, the 6th current path to be not below schmidt trigger unit input terminal by height reduce second threshold during, power list
The state of the 8th voltage of member cut-off and output remains unchanged, this state is temporary stable state, when the 6th current path is extremely less than the second threshold
When value, the 6th current path, which is tertiary voltage, makes schmidt trigger unit export first voltage, to make power cell reset lead
Lead to and attempt to export the 8th voltage, if overcurrent releases, power cell is carried out the output of the 8th voltage, and whole system will be restored
The stable state of power tube normally, if overcurrent continue, power tube will also export the 5th voltage, and then repeat overcurrent protection action and
Reseting procedure, first threshold are more than second threshold.
Embodiment 2
As shown in Fig. 2, the schmidt trigger unit of the circuit is additionally arranged reference potential input terminal Vr, specifically, this applies close
Special trigger is made of comparator A1, resistance R1 and positive feedback resistor R2.An as hysteresis loop comparator.
Can also be that the hysteresis that constitutes of comparator is more electric it is well known that Schmidt trigger can be one-input terminal
Road, the former first threshold and second threshold are determined by Schmidt trigger internal circuit configuration, are relatively solid
Fixed voltage value, the first threshold and second threshold of the latter be it is adjustable, it is in the same direction such as 1100 internal comparator A1 in figure
Input terminal, can be by adjusting the ratio of Vr voltage values or adjustment resistance R1, R2 to institute as " double reference edges of hysteresis voltage "
It states first threshold and second threshold is adjusted, wherein adjustment first threshold can change power tube overcurrent protection and start to control a little, so that
The circuit parameter is suitable for selected power tube and current protection requirement, and adjustment second threshold can change " return difference time ", temporarily
Steady state time will change, and can change short-circuit burst pulse frequency when sequential short circuit or overcurrent.
Remaining circuit is identical as previous embodiment 1.
Embodiment 3
As shown in figure 3, the Schmidt trigger of the present embodiment is the hysteresis loop comparator that comparator is constituted, circuit structure
It is：
Schmidt trigger unit 1100 includes comparator A1, resistance R4 and R5, in the in-phase input end of comparator A1 and defeated
Positive feedback resistor R4 is connected between outlet, the one end pull-up resistor R5 connection comparator output terminal, the other end are for receiving direct current
The output end of pressure, the input terminal of the inverting input of comparator A1 as Schmidt trigger, comparator A1 is tactile as Schmidt
The output end of device is sent out, the in-phase input end of comparator A1 is used as with reference to current potential input terminal Vr, and such comparator constitutes hysteresis and compares
Device, that is, the Schmidt trigger with hysteresis voltage Trigger Function,
Input terminal, that is, grid of the output end of schmidt trigger unit 1100 and the power field effect pipe Q1 of power cell 200
Connection, the output end of power tube Q1 drains to be connected with one end resistance R7 of feedback unit 300, and the drain electrode of power tube Q1 is as whole
The output end of a overcurrent protection driving circuit is used to control the cathode of external loading, the resistance R7 other ends and the first clamping unit
The anode of 400 input terminal, that is, diode D1, the input terminal of delay unit 500 connect simultaneously,
Delay unit 500 includes resistance R6, diode D2 and capacitance C1, and the one end resistance R6 connects work with diode D2 anodes
For the input terminal of delay unit, the resistance R6 other ends and one end of diode D2 cathode and capacitance C1 are connected to delay unit
Output end is connect with the inverting input of comparator A1, the other end ground connection of capacitance C1, and the output end of the first clamping unit 400 is
The cathode of diode D1 is connected with the output end of schmidt trigger unit 1100,
Foregoing circuit is to constitute the overcurrent protection driving circuit with specific function, also adds voltage stabilizing list in Fig. 3 in addition
Member 900, partial pressure unit 800, voltage regulation unit 900 therein are composed in series by resistance R1 and zener diode D3, and the one of resistance R1
End connection positive pole, the other end and zener diode D3 cathode are connected to output end of pressure-stabilizing, the anode of zener diode D3
Ground connection.Partial pressure unit 800 is composed in series by resistance R2 and R3, output end of pressure-stabilizing, the electricity of one end connection voltage regulation unit of resistance R2
The connecting node for hindering R2 and R3 is exported as partial pressure, for providing reference potential, the resistance R3 other ends for schmidt trigger unit
Ground connection.
Its course of work is described below：
(1) when powering on, since capacitance C1 both end voltages cannot be mutated, input terminal, that is, comparator A1 of Schmidt circuit
Inverting input be low level, the voltage that the in-phase input end of comparator A1 is obtained is 900 output voltage of voltage regulation unit warp
The partial pressure value that partial pressure unit 800 is obtained after dividing, it is clear that the partial pressure value is higher than powered on moment capacitance C1 cathode voltages, because
This comparator A1 output ends are high level output, i.e. Schmidt trigger exports first voltage, and power tube Q1 is made (to be imitated with field in figure
Should for pipe, according to the actual application or IGBT or Darlington etc.) conducting, power tube Q1 drain electrode output low levels are
Second voltage, while diode D1 cut-offs make the upper end of capacitance C1 also be low level i.e. tertiary voltage, i.e., by resistance R7, R6
The input terminal of Schmidt trigger is low level by diode D1 clampers, therefore comparator A1 still exports the i.e. first electricity of high level
Pressure, while comparator output terminal high level has been lifted comparator homophase input terminal voltage through feedback resistance R4, the same phase after lifting
Input terminal voltage is the electric by low raised high triggering of the Schmidt trigger constituted using comparator as the hysteresis circuit of core
This " high trigger voltage " is known as " first threshold " by pressure for ease of narration, this state is stable state.
(2) when overcurrent occurs for power tube Q1, the 5th voltage of pressure drop, that is, drain voltage (VD) i.e. in internal resistance will rise
Height, the voltage are faster charged by resistance R7, diode D2 to capacitance C1, when terminal voltage i.e. the 6th voltage is rapid on capacitance C1
When rising above first threshold voltage, IC1 is overturn, and comparator exports low level i.e. the 7th voltage, and power tube Q1 ends,
Its drain voltage VD (that is, power tube saturation voltage drop) is connect the 8th voltage for loading and drawing high to intimate power supply voltage, together
When diode D1 conducting, capacitance C1 is by the way that discharge tube slowly discharges (at this time over the ground inside resistance R1 and diode D1 and comparator
D2 ends), simultaneously as the low level of comparator output, which provides resistance R4, drags down R2 and R3 divider nodes i.e. comparator with mutually defeated
Enter terminal voltage, the homophase input terminal voltage after being pulled low is the low trigger voltage of Schmidt trigger reduced by height, is
This " low trigger voltage " is known as " second threshold " convenient for narration, this state is temporary stable state, up to capacitance C1 tension discharges are to low
When internal low activation threshold value voltage, it is high level output that Schmidt trigger is overturn again, while diode D1 ends, in this way
Power tube Q1 restores conducting, power tube Q1 drain electrode output low levels, and C1 continues electric discharge but on state without influence.It can be by adjusting
The ratio or adjustment resistance R4 for the voltage value or adjustment resistance R1 and R2 that voltage regulation unit 900 exports come to the first threshold and
Second threshold is adjusted, wherein adjustment first threshold can change power tube overcurrent protection and start to control a little, so that the circuit parameter is suitable
It is suitable for selected power tube and current protection requirement, adjustment second threshold that can change " return difference time ", temporary steady state time will
Change, short-circuit burst pulse frequency when sequential short circuit or overcurrent can be changed.
(3) it can add and receive external control signal, so that the circuit becomes the controlled drive with overcurrent protection function
Dynamic circuit, common method can have receives low level signal or in comparator inverting input in comparator in-phase input end
It receives high level signal or seals in resistance between comparator output terminal and power tube gate input, then additional control
The method of power tube input terminal, can receive level controling signal or pulse control signal, and can also be according to being received
Control pulse frequency, rationally design R1 and R2, C1 and R6 and R7 parameter, adjustment overcurrent protection off-period, to adapt to have
Body circuit resets cut-out and overcurrent protection resets two aspects and takes into account needs.
This driving circuit with overcurrent protection function of the utility model, makes direct sampled power pipe saturation voltage drop,
It compares for other sampling main line current samples, the method for main line current sample is often that the curent change of sample resistance lags behind
Power tube saturation voltage drop overflows, some are that circuit is just protected in pressure drop after experienced several control pulse periods on sample resistance
It just acts, actual power pipe overcurrent several periods already, so such protection circuit is not only complicated, volume is big, it is more to generate heat, and
And defencive function is unreliable, but such circuit application is still relatively broad so far.
And the protection circuit of technical solutions of the utility model, in time under Pulse Width Control, when overcurrent once occurs for power tube,
Drain electrode saturation voltage drop makes rapidly Schmidt trigger overturning, power tube cut-off, overcurrent be controlled in time, and practical application shows
Circuit reliability is high.And circuit structure is very simple, does not have high current sample resistance, is small, generate heat less, is at low cost, and it is right
All equally applicable in DC level control circuit and pulse duty factor control, application prospect is extensive.
Embodiment 4
As shown in figure 4, Schmidt trigger circuit is integrated chip.The circuit integrates core compared with earlier figures 3, with Schmidt
Hysteresis voltage specific to input terminal inside piece is instead of the required partial pressure unit of comparator in-phase input end in Fig. 3 circuits
And feedback resistance R4；On the other hand, the discharge resistance R1, C1 for eliminating capacitance C1 pass through Schmidt trigger input terminal when discharging
Internal resistance over the ground.When power tube Q1 overcurrents, the excessively high voltage that drains is that capacitance C1 charges rapidly through resistance R7 and diode D2,
1. charge path is shown in the arrow line of Fig. 4 shown in, wherein R7C1's when charging amplitude reaches the first threshold of Schmidt trigger
Time constant should meet the time span for allowing to carry temporary over-current less than power tube Q1, and general recommendations value is delicate less than 10,
It can be adjusted according to different designs.Then, when Schmidt trigger overturning, power tube end and export high potential, the first pincers
The high potential clamper that will be drained from power tube is connected in low level, since diode D2 is anti-at this time in the diode D1 of bit location
Partially, thus people C1 discharged over the ground by circuit continuation in Schmidt's input terminal, shown in 2. discharge path is shown in the arrow line of Fig. 4,
Wherein, time constant when discharge potential reaches the second threshold of Schmidt trigger is the monostable time of power tube Q1 cut-offs
Length, which influences circuit self- recoverage time and short circuit pulse frequency, when sequential short circuit or overcurrent, power tube leakage
Pole will appear continuous conducting burst pulse, and burst pulse interval is the circuit self- recoverage time, can be adjusted according to different designs.
Then, monostable time is gone over, and circuit self- recoverage is that power tube is connected and exports the stable state of low potential.
Embodiment 5
As shown in Figure 5 and Figure 6, the structure feature of the circuit is and the embodiment of Fig. 4 compares, and increases putting for capacitance C1
Resistance R6, when power tube overcurrent, power tube drain voltage through resistance R7 and diode D2 be capacitance C1 charge path such as
Arrow line is 1. shown in figure, and after the current potential of capacitance C1 rises to first threshold, Schmidt overturns before setting out, power tube cut-off,
Diode D1 conductings simultaneously, drag down discharge resistance R6 right end current potentials, and capacitance C1 passes through resistance R6 and Schmidt trigger output end
Internal discharge tube continuation is discharged over the ground, and the arrow line in path such as figure is 2. shown, and certain capacitance C1 is simultaneously also through schmidt trigger
Device input terminal discharges over the ground, it is single as gate circuit sending-end impedance it is larger, in comparison, the discharge current bigger that resistance R6 shares
A bit, this ratio for depending on the internal resistance over the ground of resistance R6 and Schmidt trigger input terminal, different flip-flop circuit internal resistances is different,
Selection should be surveyed to use.
Internal drag curve, the first threshold of Schmidt trigger and second threshold can also be risen according to power tube temperature with temperature to become
Change the factors such as curve addition correction of temperature drift resistance to offset internal resistance caused by Wen Sheng to change, it, can also be special for some circuits
It is risen using temperature protection point is arranged, this needs needs to select the temperature coefficient of suitable correction of temperature drift resistance according to function.
Claims (5)
1. a kind of overcurrent protection driving circuit, which is characterized in that including schmidt trigger unit (100), power cell (200),
Feedback unit (300), the first clamping unit (400), delay unit (500), wherein
Input terminal (201) connection of the output end (102) and the power cell (200) of the schmidt trigger unit (100),
Input terminal (301) connection of the output end (202) and the feedback unit (300) of the power cell (200), the feedback
The output end (302) of first (300) and the input terminal (401) of first clamping unit (400), the delay unit (500)
Input terminal (501) connects simultaneously, the output end (402) and the schmidt trigger unit of first clamping unit (400)
(100) output end (102) connection, output end (502) and the schmidt trigger unit of the delay unit (500)
(100) input terminal (101) connection, the schmidt trigger unit are Schmidt's reverse phase trigger circuit；
In schmidt trigger unit output turn-on command signal, that is, first voltage, so that the power cell is connected, work as institute
When stating power cell normally, described in the normal saturation voltage drop signal of power tube, that is, second voltage warp of the power cell output
The input terminal of the positive and negative input terminal and the delay unit for being fed to first clamping unit of feedback unit is touched in the Schmidt
When bill member exports first voltage, the first clamping unit clamping action is limited, makes the delay unit output tertiary voltage,
Less than the schmidt trigger unit input terminal by low raised first threshold, the tertiary voltage passes through the tertiary voltage again
The schmidt trigger unit anti-phase output first voltage maintains the power cell conducting output second voltage and is stopped, this
State is stable state；
When overcurrent occurs for the power cell, excessively high saturation voltage drop i.e. the 5th voltage of the power tube of power cell output
Input terminal through the positive and negative input terminal and the delay unit for being fed to first clamping unit of the feedback unit makes described prolong
The capacitive energy storage of Shi Danyuan occurs change dramatically and exports the 6th voltage, and the 6th voltage makes described higher than the first threshold
The 7th voltage of schmidt trigger unit anti-phase output enables the power cell end, and the power cell exports the 8th voltage, together
When, for the 8th voltage through the feedback unit by the first clamping unit clamper, the 6th voltage is single through the delay
The first and described clamping unit slowly falls after rise and/or is slowly fallen after rise through the schmidt trigger unit input terminal internal resistance, described the
Six current paths to be not below the schmidt trigger unit input terminal by height reduce second threshold during, the power list
The state of the 8th voltage of member cut-off and output remains unchanged, this state is temporary stable state, when the 6th current path is to less than the
When two threshold values, the 6th current path, which is the tertiary voltage, makes the schmidt trigger unit export first voltage, to
Make the power cell reset to be connected and attempt to export the 8th voltage, if overcurrent releases, the power cell is carried out the 8th
The output of voltage, whole system will restore the stable state of the power tube normally, if overcurrent continues, the power tube will also be defeated
Go out the 5th voltage, and then repeat the overcurrent protection action and reseting procedure, the first threshold is more than the second threshold.
2. overcurrent protection driving circuit according to claim 1, which is characterized in that the schmidt trigger unit also has
Reference potential input terminal, for providing reference voltage for the saturation voltage drop voltage value of the power cell.
3. overcurrent protection driving circuit according to claim 2, which is characterized in that the schmidt trigger unit is hysteresis
Comparator.
4. overcurrent protection driving circuit according to any one of claims 1 to 3, which is characterized in that the feedback unit
(300) include diode, and the cathode of the diode connects the power list as the input terminal of the feedback unit (300)
Member output end, for providing reference voltage for the saturation voltage drop voltage value of the power cell.
5. overcurrent protection driving circuit according to any one of claims 1 to 3, which is characterized in that the delay unit packet
Diode and capacitance are included, the diode is for making the capacitive energy storage change dramatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721418995.9U CN207819746U (en) | 2017-10-31 | 2017-10-31 | Overcurrent protection driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721418995.9U CN207819746U (en) | 2017-10-31 | 2017-10-31 | Overcurrent protection driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207819746U true CN207819746U (en) | 2018-09-04 |
Family
ID=63336105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721418995.9U Expired - Fee Related CN207819746U (en) | 2017-10-31 | 2017-10-31 | Overcurrent protection driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207819746U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103864A (en) * | 2018-09-13 | 2018-12-28 | 广州烽火众智数字技术有限公司 | A kind of compact sedan flow statistical equipment booting delay and protection circuit |
-
2017
- 2017-10-31 CN CN201721418995.9U patent/CN207819746U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103864A (en) * | 2018-09-13 | 2018-12-28 | 广州烽火众智数字技术有限公司 | A kind of compact sedan flow statistical equipment booting delay and protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105790659B (en) | Limit the voltage adjusting method and voltage regulator of overtime excitation | |
| CN206422754U (en) | A kind of electrification reset circuit | |
| CN101282036B (en) | Overcurrent protection circuit for discharging electricity | |
| JPH09121462A (en) | Constant voltage/constant current charger | |
| JPH11234916A (en) | Lithium ion battery pack | |
| CN203839985U (en) | Cell discharge overcurrent protection circuit | |
| CN206422685U (en) | A kind of soft starting circuit for suppressing surge current | |
| CN105244848A (en) | Overvoltage protection method and circuit | |
| CN105471243A (en) | Limitation circuit of starting impact current | |
| JP2023062164A (en) | battery management | |
| CN107733031A (en) | A kind of self- recoverage protection circuit and over-discharge protection circuit | |
| CN109889028A (en) | A kind of Absorption Capacitance pre-charge circuit and peak voltage absorbing circuit | |
| CN110061544A (en) | Battery protecting circuit | |
| CN207819746U (en) | Overcurrent protection driving circuit | |
| CN107070190B (en) | Power supply device and capacitance heating control method thereof | |
| CN106230040B (en) | Charging unit and its charging method | |
| CN109391137A (en) | Inhibit the soft starting circuit and method of power surge | |
| CN206865354U (en) | The Boost circuit of surge in a kind of suppression | |
| CN107666236A (en) | Overcurrent protection drive circuit | |
| KR101855631B1 (en) | Charging device for energy storage element | |
| CN214380066U (en) | A protection shield that is used for four strings of lithium cell packages of 16.8V | |
| CN109873561A (en) | A kind of the energy utilization circuit and electronic equipment of overshoot voltage | |
| CN214626465U (en) | Minimum configuration type protection plate for 12.6V three-string lithium battery pack | |
| JP2009130960A (en) | Charging/discharging test device | |
| CN208782460U (en) | A kind of list comparator overcurrent protection driving circuit and generator voltage controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180904 Termination date: 20211031 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |